I have both. They are both great sizes. I tend to use the 17 more often because it's smaller and fits better. The 22 is great if you are using it with a tote bag or traveling.
This!I personally don't like this style cosmetic case. The base is too wide (either size fits more than you'd ever need). The width (base) makes it too big to fit comfortably in any of my bags. I much prefer the older legacy cosmetic cases - a much narrower base - I think 1 1/4". I'll try to get a picture later to show you the difference.